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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '323462fbabba290b757e9c28c648365eb57eca82dc41c6141f3cc39b1f204b55' 
  AND token = 'RASuLHghvgHr+6YPtH31j10cglogq1uKpiyTUsvYcmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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