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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee153e816abb984ef8af5a34af9f20466cd8b3affd615596d945533f0a305d34' 
  AND token = 'RUmyy5VLcUe5VNuVKM/gwAwmcuEovbCmXUXmv04yh2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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