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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67870de0a8c649e15a37201e0b600711b3cad0d1ec9838e2083c1979ea33dafa' 
  AND token = 'Gr7edQDEfWqDOSPNjhDlROnoxu638NWOEiKCP4RYC0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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