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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45dc424f0b7cbd0a504bd145e4c76646f54d31fe369d49bfee0b42fcd83c54aa' 
  AND token = 'bYCV1Kh28tEC/102qhVlCYBQ1oahHPnlutkc1pmwNmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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