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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13abcbe73ec7e9dd7ed68916ef00d6a9765dafd1db3168cfc15c36dbe6dae041' 
  AND token = 'tPG0Aac6TetopXKvHDEqYULPaOGpslRP30LWCakwOvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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