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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75f1fab4a7800f7318664de297996fd63dea4a4ab9cda544f9fe37acb2faa0ea' 
  AND token = 'g/ShllEN4bCHXUpYQzs94wapNkHyaDP99ZpO4uf9VYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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