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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198785d7fa2bd06c61709e2a1c2ce3b5dad1b0848228aeb595851becdbbcd6de' 
  AND token = 'yOrhkbRLy9gr7jBzGKb+Bfk/vzEy2bk72wGuqtHxtNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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