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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '371a4ae6d9b5a33d5a887fbefe75195d9192c2b3a18c0af4100d86c54e29b9f5' 
  AND token = 'dDnh84XnvTTu2OPnh0vaFPyEQ9z5vueEeJnIJDNBbhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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