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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d93054457b7d127e8d938b808432e65adeaebba738ddbe9dc135ca6987950c6' 
  AND token = 'pB86DtL4gE3q6WyIP+FlxM3zybacKv9JTiPtbEXJo8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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