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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b95dbb257568d4295ef8b6dfa82672422a15185ddf89e0d07a513a66c3c0ef1' 
  AND token = 'FOhDBG1zBZTszS5wuw+MMiG0tkD0sMeemJzk45eFqxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00170

JSON explain

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