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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b4767195bd43c3b2aec4a77908f609260d5e3bc60fd6ed5f03f25228829246a' 
  AND token = 'TQsmS82CwWsb3G69oOSNQZtUjUWds31ujj9jpftOBWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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