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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '145f00c344b017424812299f11d807c35fa3d1e8892f16218dec0c6958ea76db' 
  AND token = 'veAbzaXvUEVgqR1uWbNR00+7s190K769rc0Twgo3FRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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