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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1667cfd9a77ff181c07930188a978d3641411cea1ae9001ead546fe33c9e0fe0' 
  AND token = 'X9t17dFWprVsoLEgH1tCI3PXaGbeAZr8179nt1g5GQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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