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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7ce185595a327cbf58a0f60494aa4a8c9b60cda330e85bec142038be06e208' 
  AND token = 'teMZOW4GSULbsRfakl5wo0jzZPxwyfKqUXsxmEP78p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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