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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5304f1b759cd3a095419422cd18b2e5813a9985f24c4781132f1c700dfeac01' 
  AND token = 'Z7AMTrP74ZtzVdDnJkH5Xbx22LSGaMay9TDPuqYwDGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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