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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b80fed301b1a17c17d9d9d2da40552e52bfbcc2fda7eaf2e6d795077c0f51632' 
  AND token = 'l6bYinzjwLS9gJQrcx7U1cSNH1lcgUJ+rbIsBu8K8e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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