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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2742771571f572c2b28f3c759182cc772aa2023f201384e713502b7e0f069aec' 
  AND token = 'tWz2fQmznxMa8xLV6yv6fWRoI/OG3Pa1kM288xzv4ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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