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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b10bab5adb4ed4acb7d9711158c8fe5431c5dc6fbe2f385fd7e2e62a3e97413b' 
  AND token = 'NnYElUyP/NoIWMT+D4VMuBCELEYfQGFzxD+2u37ZPds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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