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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a736f2f1082a87aa35d6448589f8a9c3eb84e21caef282b6450ce791d554ee4' 
  AND token = 'FPrGYDcIgooU907nm+ExfLRHwIdD/YHoJNdUP2aUaJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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