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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e815d625d5c56ee6f309ff334f59b89a5cf5ef7e2449c31b79a81de1f2be3ede' 
  AND token = '3ObrD0qR2y2G9+1+YxB0YFMiGK4+zbGhq7aaTel0n10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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