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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632c0e545c48b8c416efa88b8aafd593e05e5c8fbd06bd3af573678841b02330' 
  AND token = 'AzlanH/IM646YPOMnsRUip/fwJDjEH4x0iSEez/SBYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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