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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ac85a1dc4836132abe0bfd9553471dfb904e3a7c3ecf3768f19f369e433bf7' 
  AND token = 'GpaG9a3Fpg5oppnVCGe/i3SJxWoFiSeoHTvS/WmPojE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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