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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9845950f3f244057948bd8ef752bd9403fbe269a83caa06e9593d7f0d471f056' 
  AND token = 'H6CerJVA/ocg99nQkJQgKjJOKFDYqcdN82WUcaijYJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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