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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abc6c6463d85cde9a147c10bb9684c354a464287e7c111df7bd38b578a3bf1ea' 
  AND token = 'gH/ko+A962lkWT1QIvs98xyM+J3uTMSe4HOvU1RhG4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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