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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9efab9ab1c39c4a7797997b6ec782c68cb93a6aee89c6aed66a2fc0cc80eb4' 
  AND token = 'iXtEnzCk9gGepLesuKib5RcLRWAGy7625pNVEICdYIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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