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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f52dab42d88bc0ead6b22c8a4a2900342f85e8af92a77ac444cb7bbe23ab2b' 
  AND token = '4ZSII57PAa8umzbjuvmlyJgZ8kWDs0bkVIut6Ma4ECo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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