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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77cfb424087645e789d2c604cad3baa95bc35b52ff66c8b0e183badde2a44743' 
  AND token = 'Zg2fjMQ1SEqXh62BHOTxYSghOkjcxxW77EYDPOleb9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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