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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '827da1fe6c9ea83679b63fee6f3ec4308ac8cf7d3e39988b21dcb2d2cebd427d' 
  AND token = 'votVqJaF84Rff/TXIERv7yTpKWw/z/3fL8DosoF/XGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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