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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a72b179d47b4f720469ab799b0b8f2550743758131ee0fdb90f632650e51e5c9' 
  AND token = 'RhM9T2RTz09RnWlwcTfQzF4b0XgYCHIpvArQZOLAkgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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