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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd99134d36d26fd47552e436a2bdd6267aa6d7f06b76cd40cd8741c935723676' 
  AND token = 'jC127Oity2zQopDMsD+O7502tqwXm9Uu2IK58DJk30s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}