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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de93d245e7b1d7d25f45d18db3e59e880da84a2903bcc712cb610ebf71ff7019' 
  AND token = 'CUIeb89B9MI1X7euVBXCRiaReeV1o1u4zgsyyrKB5RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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