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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68264130bad54a6e4a16ad184b267a8dd58e44265f2d913a7e293f4259a1ef12' 
  AND token = 'L8m796+V/3k+1CwUB5/4Y2GphnIee+FqOJhcie7sDTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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