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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '849e8317195158b6c0b14a219a76fd090b451b2e395f380d02e3f4f28619709d' 
  AND token = 'y/W4Ke/IO/ecs1E3Tyl25ff82GKaL6fmD4ihbE+loh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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