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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbe5d62683d48f01ed0720a18e93f42730539ab003d5919e5dc895d2813ac36d' 
  AND token = 'VDz4VIkeHl7sh1WUPyo0ihO0FvpSEZhxRAI50SguQd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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