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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c2455fe142fd5f45acba42fae4e9053d22cb3042287f9500b7b059ff45a3a3c' 
  AND token = 'yK676cskDNKm4Yz2cpizhbH2y/23/B+6dhve1RKatPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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