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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5182fd2c46db4bf9fc95804cfe539617f67727b4d1a48f360e5cd82e905320de' 
  AND token = '3NS5o7dFjs/csgZE64LxASCPmSiNe7DfFzVJz1IbhSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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