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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e39df3657470bf67c98f81caad168c0cda6eeff342903e9aa81da7f2563b83' 
  AND token = '54UcdCNArAkEdMm2p1SuXPrxpfctg8nTdi1e93vRbkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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