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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c84c2efcfd65e0893ebc81ac20e2295b0879a79b908014b24a2900a0b491b56' 
  AND token = 'BTZbWxZjsuomJWL9eOsszxYXx/20irBGP3lRQ24Jpus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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