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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9a3d91b837b5305b2bb9491b28cdbfd3f747941c9088b6b39d907a4686dacf8' 
  AND token = 'hkUZ5evaEfEMcgcCDRKvXBxPf8YcxNzRx29JvVQ2BGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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