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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3af97291da61e67b6bc46ffd312679fc1edde875c8440eff0a939eeaf566722' 
  AND token = '3yDnm9aE2IANfe6Dl4gdX7LfNCvUoXWRBTD4qygQokY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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