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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95832cd11729b08d1d4ff00282c07df3e650beac9d95c3a36716df65037aed4d' 
  AND token = 'bQ8owwnpcA+0bERDExEMOhQVtlesUZwy0fAwi5YrP4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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