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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8799049f844a7bd4c9edc07215d05cb7476c9b5dfcd531bf9ebfa35eb8bed7bf' 
  AND token = 'rTvKUX2F96Fzg1jT7DGUjreo64pSY6/FlCOEX3dD198=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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