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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ab6972bbdf8ef31da9215b3ac1ff751c6b785140949e136a6b1d96800d5c33f' 
  AND token = 'E20ExzfnpNtEs+bNLu+gBoRjLA4VRRUXRAbEmIfeNPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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