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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1127589bb1f45b86922457b697f4deaa80b88913308df740e19a95cd4e04deef' 
  AND token = '5kg2NzR0KBaHT5rVVP3TKyDL13nJ0R766ciju2GnIEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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