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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ef1f972a6c2a343f82041a00113612cd6519492bab00f36294e4a6b64dccd4' 
  AND token = 'm873gSvO0hFRbybukfStOUtW5ty1qf/k9bomlCgmluY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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