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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44ed0476a32a5a17498004779f08936d5dbb9e900a6c40ff1911893e9b48e681' 
  AND token = 'aXGwFMbjBAaq/RS5EOS0GoAP//t0t3pRBPIur6fRYDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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