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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '698556e50d9211db5eedf936574976b10934039d3a837ece01a570be286b62ea' 
  AND token = 'm7gm8RE4rtfg/gz4Yses9mABcbLj3bzhjT+nrWAVOqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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