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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf3a1c4fdbbc795bbefa533e0f49d208ec6136bef7d45f97ff1b0d332c8ce03' 
  AND token = '0SpjLXSkXaRWUcr3mlnQA+WOu2ynVPhMG9GaEJen8QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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