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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f55813bfdd002cfc6da00d31f047bf93ddd6511038844102363a0b779239ae' 
  AND token = 'NyU6JR95TRl7vl6jqNtWBCy9zSlCnC7xzRKpnS+Xxis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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