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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '826ec90cc8a9a0d4253edca022507af3654a93e3db515c8ba81b82dab78661a5' 
  AND token = '4Fum86jeWsT4Euh5stmThJ1oA635f/MyyedzDateoH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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