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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef46f88a59c1f052b2a3cf33d4893035d454b2f719fe6539cbd543507a60d34' 
  AND token = '/NQ12y2YMNe/iB6KW3DM6eD+JbryNbmh1aShSBb4OcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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