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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cca312f306d54da4d3eba7d5c99ddc82c27a4d48b6fe44a5127451fad960ce6' 
  AND token = '+PxhXB0EWX+AR9dWHq6Bjf/4bd0WLHHSmbT2hlJqsrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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