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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b548576cb3e2eb04c44133183cc7b310033f7ae8399ba2de211e55923fb7aa0f' 
  AND token = 'XlcOALX/FD69c5LuU/8mCt2cBoamH4zl7pF2cH0qT3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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