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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35d80d2f0e1e61c035d3e5da33f96e8e5467e281c9f8cfca97ec0ed06dd7fb7' 
  AND token = 'iqY09YjraZqw6V8CPjb67ruqnBkFgiMLCMn3T97tr5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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