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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f8ddfa7478e84602047f11b2fa6c4cf4afb88ee43ea9b53e3f2fbd34dcfa663' 
  AND token = '3uDqRkufkgoq3VspgwhZcmIslpFqbqkZ0o6hrBWMEtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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