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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96787864b73db289347a9ebbb960e76d0fd5aa5671586155f902a1cd4ebcc06d' 
  AND token = '4J3NA/SR7p3xAJ9AvfxENMr05Aq2jDxUUbQz7z2ucQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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