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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4dae5f9ab075ca7ed69d76ceb78eb462e75a6fb43f5446b45a28fa659710e10' 
  AND token = 'O7e1ZhFO9UMGU2EKiUPtgtuz9WseVRVsAfZU7oEGSYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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