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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc2d67d400316b707c2a8b942f5b8bdd790f66d0783b5310d956d6caac3552c' 
  AND token = 'SGuQWcu/7eMQYBM1ljf59PEU3X+B5jyScdd2ZuyL3G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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