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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c0157482b7854b9cfd955bf0aac7cd6aacc169a1673c974898d3fd339738fc' 
  AND token = '+SXmR2sQFFfSrQsQ9YJH8RVy/4sA0U0B1YxJI2ccqys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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