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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8dd50fdfc7b55189439a3a53d43765bad1e08ea1ad9ef04cf7658fb51dec226' 
  AND token = '9GqE9nNmfnitc2npOW6TuiTd26AwXYR73KlVEbDv1EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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