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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6816001aa90eebf4a6d47454a0a9676d8f16ca736833f066418bf7f6a5f624eb' 
  AND token = 'xJbRwFV/e/RIDq53yOALfdWJv2FS6968qaGKfT3NmS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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