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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dff02c855a4adf7a638261027dd27113ab85608a57d1eaa8b97c7049e4fe553' 
  AND token = 'cEP1H10ZsrGekpo1w47T2a5I8fTv4B+uByzKs/hti98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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