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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237b2f9cd1895d3ca73eb45014b6174bf75e421d0a88032c79cdfcf36b27eea0' 
  AND token = 'WM1o3sKj4FXfa2bJj8o4F/r8v6GL/q5DQd5oALVbS04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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