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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '525c1852747a16dca085273157088a088763173ae944d1c1b1f2932007591ecf' 
  AND token = 'DZV3tdB0i/R+a8Wyai4ucmwlBVJS+OLISCpjiU6t8e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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