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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed86f76081e9a9c5dcdd1fc0dfa08c33a853bb8086825015f3476e0307816c84' 
  AND token = '0pqIzBCIvUXtWvHHcr59qG4hZdpMkqD0igEmGFhreI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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