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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a96a82913c9b51e18af7277fb985c6c97dd05fb130c1f9c68f95d03eb78a37c' 
  AND token = 'KGXuUTpJBWF5Rb+Ia07bsOaRyXaw6iep8uGtnPWhTJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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