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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0beb026eed32dedd88558c1db2aba3f65605271c5427f1074f6b8c8602bb6a0a' 
  AND token = 'eTp4tx/gVfAubmpErvF9C3HLimJMDtfDYl2vdpQ21uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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