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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33de97a72b4594bdbcd67796ea707e411f473b354777cef0d0b7b4acc92f02e' 
  AND token = 'CjlWfRfseadBMiKPDKpjVXRHU7+/r0Eqpy2n+lOJGH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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