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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd307c1328ab2ba18544088bafd731c7f395097f9b5b3d84f4a718963c4b94480' 
  AND token = '4+9fa/Z9GdZNxWtGyZCUqlfoa/GGrEAPHHErlhLQtio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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